Temperature-annunciator.



M. KLAIBER.

TEMPERATURE ANNUNCIATOR.

PPLICATION man 1 4 1,252,811. I Patented Jan. 8,1918.

MAXIMILIAN'KLAIBER, OF NORTH HACKENSACK, NEW JERSEY.

TEMPERATUBE-ANNUNCIATOR.

Specification of Letters Patent.

Patented Jan. 8, 1918.

Application filed January 4, 1917. Serial No. 140,595.

thermometer tube closes and opens an electric circuit to operate analarm device at a predetermined temperature and more particularly todevices of this character where the expansible liquid is mercury. I amaware of a number of attempts, only partially successful, heretoforemade to produce a practical device of this character, my aim hereinbeing to produce a device which can be economically made and will becertain in its operation.

In the drawings, Figure 1 shows a perspective view of the device inposition,

Fig. 2, a vertical section,

Fig. 3, a horizontal section showing the manner in which thethermometric column is brought into circuit with the alarm device.

A shows a backing of fiber, ebonite or other electrical non-conductingmaterial to which the device is attached. G is a metallic tubecontaining a supply of mercury into which a fiber or ebonite tube H isfitted. This tube H is of the ordinary and well known type and is not,in itself, any part of my invention. It may be composed of anynon-fragile non-conducting substance. The tube G is directly soldered orotherwise attached to the metal plate B forming part of the electriccircuit. The tube H has threaded screws K connected thereto, which fitinto holes 0 made in the fiber hacking. These metallic screws are driveninto the tube I-I before the bore M is made in same so that the bore Mis formed continuously through the solid non-conducting cylinder as wellas through the metallic screws K as shown. By this means, when themercury column rises in the tube a perfect metallic contact is obtainedbetween the body L of the screw K and the mercury in the thermometrictube. E, D and C show a series of metallic members connected to the tubeH by means of screws K and which are fastened to the backing A by thethreaded metallic contacts F,

P being the threaded heads of such contacting members. i

It is apparent that the alarm device shown may be set for anypredetermined temperature depending upon the number of contactingmembers and the particular contacting member for the setting of thealarm. I purposely leave the thermometric column open at the topto-allow for the expansion and contraction of the mercury column.

By making the thermometric tube in two parts of a metallic member tocontain the mercury and of a non-conducting member wherein the contactdevices are located, I achieve great economy in manufacture, it havingbeen found in practice that similar devices of this nature in which aglass capillary tube or a glass mercury tube was used with same wereboth impracticable and ex- I pensive. I have not shown herein the alarmdevice or the completed circuit to show its operation but it will beapparent to any person skilled in the art that one end of the electricalcircuitcontaining the alarm or other actuated device will be attached tothe member B and the'other end to either C, D or E. At T, I show anenlargement in the bore of the tube which is for the purpose of holdingany excess of mercury should the column of mercury in exceptional cases,expand above the contact member E.

I have shown a preferred embodiment of my invention, but it is obviousthat numerous changes could be made in its details, Without departingfrom its spirit, as defined in the claims. Thus, any suitable conductingmaterial could be used for the members K and numerous other minormodifications could be made.

Having now described my invention, what I desire to own and claim byLetters Patent is:

1. A method of making a tube for a thermostatic circuit closer, whichconsists in firmly embedding a metal member in a solid non-conductingcylinder and afterward forming a bore through said cylinder and throughsaid metal member, so as to form a continuous bore having an annularconducting contact member at a predetermined point along the said boreof said tube.

2. A method of making a tube for a thermostatic circuit closer, whichconsists in firmly embedding a metal member in a solid nonconductingcylinder and afterward 110 forming a bore through said cylinder, so thating member firmly embedded therein and said metallic member is connectedto the inhaving a continuous bore extending through terior of said bore.'it and said conducting member.

3. In a thermostatic circuit closer, a res- In testimony whereof Ihereunto aiiix my J ervoir containing mercury, a non-conductingsignature.

7 tube made of non-fragile material connected to said reservoir, saidtube having a conduct- MAXIMILIAN KLAIBER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

